Cadence Design Systems, Inc.

David Chyan

Satish Raj

Xiao-Dong Wang

An improved approach for implementing C-routing is described. Cost-based analysis is performed to balance the different rule requirements, to optimize the assignment of objects and nets during C-routing.

Method and system for utilizing hard and preferred rules for C-routing of electronic designs

A system and method for routing wires using an automated circuit design tool includes a process for order negotiation to adjust the ordering of wires back and forth between conduits by considering both inter-region and intra-region constraints on the layout of the wires. Order negotiation is preferably carried out by looking both forward and backward during the processing of channels, and by flexibly accounting for intra-region, crosstalk, and grouping constraints, as well as conduit exit constraints. Pairs of nets within a conduit are classified in different categories, including (1) having internal constraints, and (2) not having internal constraints. Nets having internal constraints are generally used in order negotiation for limited purposes (e.g., breaking a loop), whereas nets having no internal constraints are generally used in order negotiation for a variety of other purposes as well, including improving the layout of other conduits.

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Saratoga, CA, United States of America

David Chyan